first midterm exam (2007)

8/13/2019 First Midterm Exam (2007)

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THE IUG PHYSA 1301 DEPT. OF PHYSICSDATE:10-10-2006 FIRST MID EXAM. TIME:1-Hr

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Part I Part II Total1 2 3 ! "

PART I: #$oo%& t$& #orrt a'%(&r

1)The position of a particle is given by 52 += atx , withxin (m) and tin (s). The units of the

constant ais

a) m b) ms c) ms2 d) non of these

2)The unit of !ewton (!) is e"uivalent to

a) dyne b) #g.ms c) #g.m d) #g.ms2

3)$hich of the following "uantities is a vector

a) speed b) energy c) displacement d) time

!)The value of ( )jki

a) % b) &% c) ' d)

")The magnitude of the vector A &i*'j& 2k

a) %+ b) + c) , d) %2

6)- particle travels m east withein / s and then m north for ' s. The average speed of theparticle during the % s period is

a) % ms b) %.25 ms c) %.+ ms d)(.** .+) ms

,)The position of a particle is given by +2 '+= tx , withxin (m) and tin (s). The initial velocity (at

t=) of the particle is

a) b) + ms c) ms d) % ms

)0efering to the previous problem, the acceleration of the particle at t=% s is

a) b) ms2

c)% ms2

d) %2 ms2


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)- car, initially at rest, travels 2 m in + s with constant acceleration. The acceleration of the car is

a) .+ ms2 b) %.' ms2 c) 2.5 ms2 d) +.1 ms2

10)- ball is thrown vertically upward with initial speed of ms. t hits the ground with a speed of%2 ms. The time of flight of the ball is

a) %. s b) . s c) 2.+ s d) %.2 s

11)- plane flies with a velocity of 5 #mhr north with respect to the wind. f the wind blows eastwith a speed of 2 #mhr, the speed of the plane relative to the earth is

a) / #mhr b) ' #mhr c) 5'1 #mhr d) +5 #mhr

12)- pro3ectile is thrown with a speed of 25 ms at an angle of '/ owith the hori4ontal, the speed of

the pro3ectile at its maimum height is

a) b) 2 ms c) %5 ms d) 25 ms

13)-cceleration is always in the direction of the

a) displacement b) initial velocity c) final velocity d) the net force

1!)The mass is a measure of

a) weight b) force c) inertia d) acceleration

1")- bloc# of mass m= #g rests on a smooth hori4ontal surface. t ispulled to thr eight by a force of %2 ! that ma#es an angle of owith thehori4ontal, as shown. The force eerted on the bloc# by the surface is

a) 5. ! b) c) %.2 ! d) &%.2 !

2

#g

%5 !

o


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PART II: Sol/& t$& ollo(*' rol&4%

1) 6ou are given A '*7+* 25, and '* & 2+. 8ind A

2)- particle is thrown from the top of a building 5 m inheight with initial speed of +ms that ma#es an angle of '/o

above the hori4ontal. $hat is the velocity of the particle 3ustbefore hitting the ground9

'

'/o

+ ms

5 m


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3)- bloc# of mass m=+ #g is on an inclined, rough surface asshown in the figure. The angle of inclination is ='oand the

coefficients of frictions are '.(/.( and == ks . 8inf The

frictional forcefacting on the bloc#.

!)Two bloc#s of masses #g and + #g connected by a rope,rest on a hori4ontal surface. The bloc#s are pulled to theright by applying a force of ! to the +g bloc# asshown in the 8igure. f the coefficients of friction between

the bloc#s and the surface are +.(,.( and == ks .

alculate the tension in the rope.

+

'o

+ #g

+ #g #g !

first midterm exam (2007)

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